Gear grinder



0. GARRisoN Feb. 16 W26.

GEAR GRINDER Filed Sept 4, 1923 2 Sheets-Sheet l 0. GARRISON Feb. 16 1926.

GEAR GRI NDER Filed Sept. 4:, 1923 2 Sheets-Sheet 2 llHllHlHHHHHHHH Ill IHHHHHHHI S nugmtoz Patented F eb. 16, 1926.

UNITED {STATES ORLANDO GARBISON, 0F DAYTON, OHIO.

GEAR GRINDER.

Application filed September 4, 1923. Serial No. 860,804.

To all whom it may concern:

Be it known that I, ORLANDO GARRISON, a citizen of the United States, residing in Dayton, in the county of'Montgomery and State of Ohio, have invented certain new and useful Improvements in Gear Grinders, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in gear grinders, having particular reference to the type of machine illustrated and described in Letters Patent of the United States No. 491,653, issued to me March 26, 1923.

The objects attained in the later improvements which constitute the subject matter of thepresent invention relate to the mechanism for dressing the abrasive disc, or grinder wheel, by means of which the gears are ground.

In commercial practice of gear grinding both quality and quantity must be attained,-

accuracy within very close limits and output on a production cost basis must be maintained. The grinder wheel is one of the determining factors of these results. The allowed limits of accuracy can be maintained only by keeping the grinder wheel properly dressed, and output necessary'to profitable operation can be realized only by sustained production.

Thus the objects attained in these later improvements relate to the location of the wheel dresser relative to other coordinated mechanisms; to its general construction which tends to maintain accuracy of the mechanism with minimum attention given thereto; to simplicity of operation and the time required for dressing operation, all of which are determining factors, more or less, which enter into commercial gear grinding.

To this end, as shown in the accompanying drawings, the dresser is located inclose proximity to the grinder wheel, the mechanism in all its parts is constructed to exclude grit and to minimize wear, the dressing operations are simple, of short duration and do not require skill on the part of the operator.

In the drawings:

Fig. 1, is a side elevation of a gear grinder of the type herein referred to; have.

ing-"the improved wheel dresser applied thereto; 7

Fig. 2, is a detail longitudinal sectional view of the dresser;

Fig. 3, is a transverse sectional view taken on the line 3-3 of Fig. 2;

. Fig. 4, is a cross sectional view taken on the line 44 of Fig. 2.

' The gear grinder shown in Fig. 1, of the drawings serves merely to illustrate the application of the improved grinder, wheel dresser to one type of machine, it being understood that the wheel dresser has general application. The main machine, therefore, as here shown, being no part of the invention except the illustrative relation it sustains thereto, will be given only a brief general description as an introductory to the detained specification.

The supporting structure of the ma.- chine comprises a base 1, base housing -2, supported on base -1, a knee, or overhanging table 3, projecting forwardly of housing 2, and a ram 4 operable on housing -2, the grinder whee l dresser 5, as here shown being mounted on the ram.

Power is applied to the main machine by means of a belt pulley -6, and intermediate pulleys 7 and 8, connected one with the ing mechanism inside housing 2, and the mechanism supported on table 3, for moving the work .15, gears to be ground rotatably and laterally relative to the grinder wheel -10, and to align the work in accurate relations therewith to receive the grinding operation.

The grinder wheel is supported on the ram by means of a forwardly extended bearing bracket -16, which is connected to the end of the ram by a dovetailed construction -17, a feed screw'18, connected to the bracket 16, by a threaded lug 19, and operable by a handle 20 serving as a means to adjust the grinder wheel vertically relative to the work, a graduated scale 21, indicating the extent of vertical ad-' justment thereof.

Secured -to bracket 16, by means of screws 22, and adjusted vertically by means of 'ack screws 22'}, is a second overa band 36, wh1ch is han ing racket 23, and connected. to brac et 23, by a dovetailed constrction 24, is a third overhanging bracket -25, a feed screw -26, supported on bracket 23,; and connected to bracket 25, by a screw lug 27, and operated by a handle 28, serving as a means for adjustin bracket -25, and the wheel dresser which 1s carried thereby, vertically relative to the grinder wheel --10, a graduated scale 29, serving to indicate the extent of vertical adjustment thereof.

Formed integrallyrwith bracket is an aperturedbase member 30 which extends forward of the bracket, overhanging the grinder wheel and serving as a bearing support for an a ertured, rotatable member 31, provided with an annular flange 32, which serves to sup 'ort member 31 on base member 30. he lower portion of member-31, extends through the bearing aperture of member 30, and is threaded to receive a bearing collar 33, and a bearing adjusting ring -34. Secured to flange 32, of member 31, by means of screws 35, is

rovided with opposite notches 37, adapted to be engaged by a pawl -38, pivoted on one extension 39, of member 30, and having a handle -40, for disenga ng the pawl from notches 37; a ban e 41 is also secured to member 31 to provide for moving the member together with the wheel dresser, which is carried by it a half turn.

Member 31 is further provided with an upwardly extended ortion 42, and a downwardly extended portion 43, which support the wheel dresser supporting m'ember 44, the connection between parts -42 and 43 and housing 44, consisting of a double dovetailed construction 45, and 46, the parts being retained in proper adjustment one with the other by means of an angle block 47, secured to member 44, by a screw 48. The method of mounting the wheel dresser also provides for setting member 44, at any desired angle relative to the vertical members -42, and 43, and a scale 49 secured to member 42, serving to indicate the degree of angularity and the set screw 48, to retain the parts in position.

Wheel dresser 'member.44, has a head portion 50, formed integrally thergwith,

, and a channelled member 51, secured thereto in any suitable manner, the channel being covered by a plate 52, mounting of parts 51 and 52, being preferably by means of screws (not shown); Slidably operable in the channel of part 51, is the dresser tool bar 53, which is connected at its upper end'as at 54, to' a feed screw 55, which operates axially in a threaded rotatable sleeve 56, the sleeve being operable rot'atably by means of a handle 56" connected to sleeve ---56 by means of a hen.

screw 56"., Thus upon turning of the handle 56, the dresser tool'will be moved longitudinally in the channel. of member 51, into engagement with the grinder wheel. To effect a close bearing relation of bar 53, in the channel of member 51, a bearin plate 57, is inserted along one edge thereoi and is adjustable relative thereto b means of screws 58, set in the adjacent we 1 of member 51. The lower end of bar 53, extends beyond member 51, and is provided with a head +59, in which carbons or diamonds 60 and 61, are mounted for dressing the grinder wheel. I

Bar 53, is moved in its an ular longitudinal plane by turning han le.56, thus the wheel dresser element 61, is moved across one of the angular faces 2, of the grinder wheel, thus dressing thedwheel to the angle determined by setting of the mechanism relative to scale 49. To dress the opposite face a, the mechanism is moved a half turn by means of handle 41, as best illustrated in Fig. 4, and the operation of the dresser tool is repeated. Upon turning the mechanism a quarter turn dresserielement -60, will be brought into the plane of .the grinder Wheel, and is then moved into'cngagement therewith by operating handle 56, to dress the central face -b, between the angular faces 22 of the grinder wheel.

As the grinder wheel is reduced by dressing of the wheel, the dresser mechanism as a whole is moved downwardly to a like extent by means of the feed .screw handle 20, the adjustment reading being taken on the graduated dial -21. For the convenience of the operator and to insure against error both graduated dials 21, and -29 are made adjustable by means of set screws 21 and 29". Thus in setting the mechanism for grinding the first gear of a given specification, both dials -21 and 29 are set at the zero reading and are thereafter adjusted to the same extent for each wheel dressing operation. By this arrangement the periphery of the grinder wheel is kept at the same distance vertically from thecenter of the work spindle 62, and all the gears ground will be to the same specification. At intervals the dresser elements 60, and 61, will require adjustment of the mounting heads 60 and 61*, to present a new cutting edge to the grinder wheel to compensate for wear of the dresser elements.

In grinding gears on a machine of'the character herein illustrated, the dressed edge of the grinder wheel passes through mesh with the gears being ground in the same relation as a master rack tooth with a master gear, thus the edge of the grinder adjustments of the dresser member -53,

the accuracy of the construction being maintained indefinitely by the long bearing surfaces which act to minimize wear of the parts.

Accuracy of construction and provlslon to minimize wear and to compensate for wear, thus providing for quality andquantity production of ground gears are structural features throughout the mechanism as herein shown and described.

Having described my invention, I claim:

1. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, a member supported to rotate in said aperture, a member supported by said second member and adapted to be adjusted angularly thereon, and a dresser tool mounted on the last named member and adapted to be moved into engagement with ,the grinder wheel.

2. A grinding wheel dresser including in combination witlra member adapted to be moved relative to the grinder wheel and comprising a laterally extended base having a bearing aperture, a member supported to rotate in said aperture, a member supported by adjusted angularly thereon, and a dresser tool mounted on the last named member and adapted to be moved into engagement with the grinder wheel.

3. A grinder wheel dresser including in combination with a member adapted to be moved ina vertical plane relative to the grinder wheel and comprising a base extended laterally in a horizontal plane and having a bearing aperture, a member supported to rotate in said aperture, a member supported by said second member and adapted to be adjusted angularly thereon, and a dresser tool mounted on the last named member and adapted to be moved into engagement with the grinder wheel.

4. A grinder wheel dresser including in combination with a member having axial movement and comprising a part having a bearing aperture disposedat an angle to the axis of said member, graduated means to indicate the extent of said movement, a member supported to rotate in said aperture, a member supported by said second member said second member and adapted to be and adapted to be adjusted angularly thereon, and a dresser tool mounted on the last named member and adapted to be moved into'engagement with the grinder wheel.

5. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing a erture, a member supported to be rotate in said bearing aperture to a plurality of predetermined positions, a member sup orted by said second member and adapted to be adjusted angularly thereon, and a dresser tool mounted on the last named member and adapted to be moved whereby to bring said tool into enga ement .with dirferent working surfaces 0 the grinder wheel.

6. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing a erture, a member supported to be rotate in said bearing aperture to a. pluralit Y of predetermined positions, means to a just said rotatable member relative to said bearing and means to retain said member in one of said prede-v termined positions, a member su ported by said second member and adapte to be adjusted angularly thereon, whereby to bring said tool into engagement with different working surfaces of the grinding wheel.

7. A grinder wheel dresser includingin combination with a member adapted to'be moved relative to the grinder wheel and havinga bearing aperture, a member supporte to be rotated in said bearing aper ture to aj plurality of predetermined positions, means to retain said member in one of said positions comprising a part having a notch movable with the rotatable member and a pawl pivoted on said first named member and adapted to en age said notch, a member supported by sai and adapted to be adjusted angularly thereon, whereby to bring said tool into engagement with different working surfaces of the grinder wheel.

8. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, ported to be rotated in said bearing aperture, means carried by the rotatable member to adjust the same relative to the bearing comprising a supporting flange for second member a member supmoved relative to the grinder wheel and having a bearing aperture, a member rotatably supported in said bearing aperture and a ertured in the axial plane thereof, a mem er supported by said second member, within the aperture thereof and adapted to be adjusted angularly relative to the supporting member, and a dresser tool mounted on the last named member and adapted to,

be moved into engagement with the grinder wheel.

10. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, .a member supported on said second member within the member supported, on said second member and adapted to receive graduated angular adjustments relative thereto, and a dressing tool mounted on the last named member and adapted to be moved relative thereto, whereby to move said tool in variable angular relations into engagement with the grinder wheel. 12. A grinder wheel dresser including i I combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, a member rotatably supported in said bearing+.aperture, a member rotatably supported on said second member and adapted to receive graduated angular adjustments relative thereto, and a dressing tool mounted on the last named member and adapted to be moved relative thereto, whereby to move said tool in variable angular relations into engagement with the grinder wheel.

13. A grinder wheel dresserincluding incombination with a member adapted to be moved/relative to the grinder wheel and having. a bearing aperture, a member rotatably supported in said bearing aperture, a member rotatably supported by dovetailed connections on said second member and adapted to receive graduated angular adjustments relative thereto, and a dressing tool mounted on the last named member and adapted to be moved relative thereto, where by to move said tool in variable angular relations into engagement with the grinder wheel.

14. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, a member rotatably supported. in saidibearing aperture, a

-member rotatably supported on said second member means of a pluralityiof dovetailed connections arranged to a common center and adapted to receive variable angular adjustments, and mounted on the last named member and adapted to be moved relative thereto, whereby to move said tool in variable angular relations into engagement with the grinder Wheel.

15. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, a tool su portin member mounted on said secon name member comprising a channelled housing having a head portion, a feed screw supported in said head portion and means for actuating the same, a dresser tool connected to the feed screw and adapted upon operation of the same to be moved slidably in said channelled. housing into engagement with thegrinder wheel.

16. A grinder wheel dresser including in combination with a member adapted to be moved relative to the grinder wheel and having a bearing aperture, a tool supporting member mounted on said second named member comprising a channelled housing having a head portion, a threaded sleeve and means for operating the same rotatably in said head portion a feed screw adapted to be operated'in said sleeve and a dresser tool connected to the feed screw and adapted to be moved slidably thereby in said channelled housing into engagement with the grinder Wheel.

17 A grinder wheel dresser including in combination with, a member supported at right angles to the axis of the grinder wheel and adapted to be rotated from one side to the other of the plane of rotation of said wheel, a member supported by said rotatable member and adapted to be adjusted angularly in'the' axial plane thereof, and a dresser tool supported on said adjustable member and adapted to be moved at variable angles into engagement with the a dressing tool sis dresser tool operable in said angular member into engagement with the grinder wheel.

19. A grinder wheel dresser including in combination with a ram having a grinder wheel mounted thereon, a member supported on the ram and adapted to be moved in the plane of rotation of the grinder wheel, a member supported on said last named member and adapted to be rotated at right angles to the plane of rotation of the grinder wheel, a member'mounted on an angle on said rotatable member, and a dresser tool operable in said angular member into engagement with the grinder wheel.

20. A grinder wheel dresser including in combination with a ram having a grinder wheel mounted thereon, a member supported on the ram and adapted to be rotated at right angles to the plane of rotation of the grinder wheel, a member mounted and ad- 20 justable angularly on said rotatable member, and a dresser tool operable in said angular member into engagement with the grinder wheel.

21. A grinder wheel adapted to be adjusted vertically relative to the work spindle of a gear grinder, a wheel dresser adapted to be adjusted vertically relative to the grinder wheel, separate graduated means to indicatethe extent of each of said adjustments and means to adjust said graduated means relatively one to the other whereby to effect coordinated readings thereof in grinding gears in quantities to a given specification.

In testimony whereof, I aflix my signa-- ture.

ORLANDO GARRISON. 

